Re: Still struggling with table access tracking

[Florian Berger <fberger@...>]

Mark Hamburg wrote:

> The first issue that leaps out at me is that TrackAll generates proxy tables
> for subtables which it then throws away. You probably want to copy the
> contents of table to be tracked over into a new table, empty the original
> table, and use the original table as the proxy. (It would be nice if there
> were a way to force Lua to shrink the original table after doing so.)

Thanks for help. I think I got things working the way I wanted.

Here is sample code of my table tracking (case somebody is interested):
local index = {}
local info  = {}
local mt

function Access(t, k)
  print('* Access to element ' .. tostring(k))

  return t[index][k]
end

function Assign(t, k, v)
  print('* Update of element ' .. tostring(k) .. ' to ' .. tostring(v))

  if type(v) == 'table' then
    TrackAll(v)

    if not getmetatable(v) then
      local tNew = v
      v = {}
      v[index] = tNew

      setmetatable(v, mt)
    end
  end

  t[index][k] = v
end

mt = {
  __index = Access,
  __newindex = Assign
}

function Track(t)
  local proxy = {}
  proxy[index] = t
  setmetatable(proxy, mt)

  return proxy
end

function TrackAll(t)
  for k, v in pairs(t) do
    if type(v) == 'table' then
      TrackAll(v)

      if not getmetatable(t[k]) then
        local tNew = t[k]
        t[k] = {}
        t[k][index] = tNew

        setmetatable(t[k], mt)
      end
    end
  end
end

-- Test
A = {}
A = Track(A)

A.B = {
  C = {
    D = 'd'
  }
}

print(A.B.C.D)
A.B.C.D = 'D'

--> * Update of element B to table: 0037A720
--> * Access to element B
--> * Access to element C
--> * Access to element D
--> d
--> * Access to element B
--> * Access to element C
--> * Update of element D to D


floru